<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        #h1 {
            color: #ff0000;
        }
        #h2 {
            color: #0f0;
        }
        #h3 {
            color: rgb(0,0,255);
        }
        #h4 {
            color: rgba(255,0,0,0.3);
        }
    </style>
</head>
<body>
<h1 id="h1">颜色测试1</h1>
<h1 id="h2">颜色测试2</h1>
<h1 id="h3">颜色测试3</h1>
<h1 id="h4">颜色测试4</h1>
</body>
</html>